小儿急性肾功能衰竭100例临床分析

介绍１００例小儿急性肾功能衰竭（ＡＲＦ）的病因、临床表现、实验室检查、病理及预后。肾前性１３例（１３％），肾性８６例（８６％），其中肾小球疾病６６例（６６％），肾后性１例（１％）。３１例肾活检，病理为９种类型，毛细血管内增生性肾小球肾炎（ＥｎＰＧＮ）８例（２５．８１％），系膜增殖性肾小球肾炎（ＭｓＰＧＮ）４例（１２．９０％），膜增殖性肾小球肾炎（ＭＰＧＮ）Ｉ型５例（１６．１３％），局灶节段性肾小球     

EFFECTS OF MELATONIN ADMINISTRATION TO RATS WITH GLYCEROL-INDUCED ACUTE RENAL FAILURE

Melatonin, the pineal hormone with antioxidative properties was administered to rats with glycerol-induced myoglobinuric acute renal failure (Gly-ARF). This model is characterized by acute tubular necrosis mediated by heme-iron oxidative stress. Rats received melatonin (20 mg/kg) concomitant and 3 h after glycerol injection. Gly-ARF rats showed at 24 h a 78% reduction in glomerular filtration rate, whereas this decrement was significantly reduced to 35% in the melatonin treated Gly-ARF rats. Tubular function evaluated by tubular reabsorption of sodium and lithium was also preserved in melatonin treated rats. The histologic analysis revealed extensive cortical tubular necrosis that was significantly reduced by melatonin treatment. The renal concentration of malondialdehyde (MDA) was increased 6 h after glycerol injection in Gly-ARF and this elevation was prevented when melatonin was administered. Renal concentration of reduced glutathione (GSH) was decreased at 6 h in Gly-ARF and melatonin did not reverse this decrease. It was concluded that melatonin administration attenuated the renal injury in the glycerol model of acute renal failure and reduced kidney oxidative stress through a GSH-independent mechanism.     

PRODUCTION AND ACTIVATION OF HEPATOCYTE GROWTH FACTOR IN ACUTE RENAL FAILURE

Hepatocyte growth factor (HGF) facilitates the regeneration of injured kidney in acute renal failure (ARF). HGF is produced as a single-chain precursor by cells of mesenchymal origin and is converted to a biologically active, heterodimeric molecule by proteol ytic processing.

We studied HGF mRNA and protein levels in systemic organs of glycerol-induced ARF rats, a model of crush syndrome. HGF protein concentration of tissue homogenate was measured by ELISA. Both mRNA and protein levels were increased in liver and spleen at 24 hours after the glycerol injection whereas HGF protein level was decreased in the injured kidney. Expression of HGF receptor/c-met mRNA was elevated only in the kidney. These results suggest that HGF supplied in an endocrine manner may play an important role in the regenerating process following ARF.

Next, we measured serum HGF concentration by ELISA in 8 ARF patients caused by crush syndrome and the molecular size of serum HGF was determined byimmun oblotting. Although serum HGF levels elevated in all patients, the HGF levels did not associate with their prognoses. While a single-chain molecule was predominantly observed in sera from chronic renal failure patients and healthy subjects, the majority of serum HGF was a heterodimeric form in 7 ARF patients. In one patient who developed disseminated intravascular coagulation syndrome and had a poor prognosis, a single-chain molecule was predominant although the serum HGF concentration was equivalent. These data suggest that the activity of proteolytic processing may be also an important factor for the expression of the biological function of HGF.     

N-ACETYLCYSTEINE AS SALVAGE THERAPY IN CISPLATIN NEPHROTOXICITY

N-acetylcysteine (NAC) repletes intracellular stores of reduced glutathione and may be a scavenger of oxygen free radicals. We report a 52-year-old female who developed acute renal insufficiency after administration of one dose of 150 mg of cisplatin for treatment of squamous cell cancer of the esophagus. Her blood urea nitrogen and creatinine rose from 12 and 0.7 mg/dL, respectively, to 24 and 1.8 mg/dL on day 5 after cisplatin. On that day the patient was begun on NAC, starting with a loading dose of 140-mg/kg-body weight followed by 70 mg/kg every 4 h for 4 days. Two days after starting NAC her renal function began to improve, and although she failed to complete a full course of the drug, by day 10 her serum creatinine had fallen to 0.8 mg/dL. A previous report showed that N-acetylcysteine might reverse cisplatin-induced renal toxicity. Our case supports this hypothesis.     

THE IMPACT OF CHRONIC RENAL FAILURE ON NITRIC OXIDE SYNTHASE ISOFORMS GENE EXPRESSION IN THE PENIS AND PELVIC GANGLIA OF RATS

PURPOSE: Patients with chronic renal failure experience a variety of physical and metabolic alterations. Uremia is often accompanied by erectile dysfunction (ED). Little information is available concerning the underlying pathophysiological mechanisms by which chronic renal failure can lead to erectile dysfunction. In this study, chronic renal failure was induced by 5/6 nephrectomy in a rat model. Cavernous nerve stimulation was used to measure the intracavernous pressure (ICP) rise. MATERIALS AND METHODS: Adult male Sprague-Dawley rats, aged between 10-12 weeks and weighing 200-250 gm. were divided into two groups. The first group (n = 20) served as a control (sham-operated) and underwent laparotomy with dissection of the perirenal fat around both kidneys. The second group (n = 40) were subjected to an excisional 5/6 nephrectomy (unilateral nephrectomy and contralateral upper and lower polar nephrectomy). Serum creatinine was measured 3 days post-operatively and at the end of the 12th week. Development of renal failure was considered if the animal had serum creatinine more than 120 microM/l. After 12 weeks, 10 animals per group were subjected to electric field stimulation (EFS) of the cavernous nerve with simultaneous recording of ICP-rise and systemic blood pressure. Northern and western blot analyses were used to determine the mRNA expression and protein contents of NOS isoforms (neuronal and endothelial) in the penile tissues and MPG. RESULTS: This remnant kidney model resulted in renal failure in 20 of 40 animals. The ICP-rise after cavernous nerve stimulation in the renal failure group was significantly impaired, 7.7+/-2.9 cm. H2O, as compared to control rats, 55.5+/-1.2 cm. H2O (p<0.001). The latency period after cavernous nerve stimulation was significantly increased in renal failure rats (6.9+/-0.95 sec.) in comparison to controls (2.4+/-0.25 sec.). Six of ten uremic animals had significantly lower testosterone (<1 nmol./l.) levels compared to non-uremic rats (3.6 nmol./l.) (p<0.005). Northern blot analysis revealed that renal failure rats had significantly higher levels of nNOS mRNA in the MPG and penile tissues than controls. There was no change in eNOS mRNA in either group. Western blot analysis demonstrated that eNOS and nNOS protein contents in the MPG and penile tissues of renal failure rats were significantly higher than those of controls. CONCLUSION: This report demonstrates that impairment of erection in renal failure rats, as determined by ICP-rise, was present in spite of elevated neuronal nitric oxide synthase mRNA and its protein in the MPG and penile tissues. Further studies are needed to determine whether erectile dysfunction is a result of post-translational changes, circulating inhibitory substances or other factors.     

ACUTE RENAL FAILURE IN NEUROLEPTIC MALIGNANT SYNDROME

We report a patient with neuroleptic malignant syndrome (NMS) who developed acute renal failure and was successfully treated by hemodialysis. A 60-year-old man with a 26-year history of schizophrenia had been treated with thioridazine and sulpiride. He was admitted to our hospital for muscular rigidity and oliguria. After the diagnosis of NMS with acute renal failure was established, thioridazine and sulpiride were discontinued and hemodialysis was instituted. Renal function gradually improved and hemodialysis was discontinued after 17th treatment. We also reviewed 57 cases of NMS with acute renal failure reported in the literature. To our knowledge, 26 years is the longest latency between initiation of neuroleptic drug treatment and onset of NMS. Our review of reported NMS cases with acute renal failure identified those risks for poor prognosis as high level of BUN, age and female gender.     

ACUTE RENAL FAILURE IN THE ELDERLY: A FIVE-YEAR EXPERIENCE

It is commonly believed that religion has no influence on medication compliance. We present a case in which belief in faith healing led to discontinuation of immunosuppressive medications after renal transplantation. Conflict occurs when patients believe they are healed but experience continued illness. Religious and spiritual beliefs should be assessed pre-and post-transplant, and efforts made to encourage medication compliance.     

UNUSUAL PRESENTATION OF MESANGIAL PROLIFERATIVE GLOMERULONEPHRITIS IN HELLP SYNDROME ASSOCIATED WITH ACUTE RENAL FAILURE

Acute renal failure in pregnancy is not common in industrialized countries. HELLP syndrome (hemolysis, elevated liver enzyme, and low platelets) was one of the causes of acute renal failure in pregnancy, but renal pathological findings in case of acute renal failure had rarely been reported. We reported an unusual case of HELLP syndrome with acute renal failure requiring renal replacement therapy and which histopathologic findings of kidney biopsy showed mesangial proliferative glomerulonephritis and her renal function completely recovered after immediate artificial abortion, supportive management, transfusion of blood products, and hemodialysis.     

DIARRHEA ASSOCIATED ACUTE RENAL FAILURE IN A PATIENT WITH SALMONELLA ENTERITIDIS SEPSIS

Salmonella enteritidis infection occurs primarily in animals and often results in self-limited gastroenteritis in accidental cross contamination in human. However, the acute renal failure could be a rare but serious complication of the S. enteritidis infection. We report one case of acute renal failure from severe dehydration caused by S. enteritidis food poisoning. The acute renal failure completely recovered after hydration and antibiotic treatment.     

DEVELOPMENT OF CHRONIC RENAL FAILURE IN ADULT PURE MESANGIAL GLOMERULONEPHRITIS

Mesangial glomerulonephritis is uncommon histopathological pattern as a part of primary glomerular diseases. 64 (6.6%) patients of 968 non-transplant renal biopsies done at our department presented pure mesangial glomerulonephritis, without evidence of IgA nephropathy or systemic disorders. 22/64 (34.7%) of the patients presented with nephrotic syndrome, 12 were male, 10 female, aged 33.32 ± 3.14. All of them were treated with steroids, 3/22 revealed complete remission, 4/22 partial remission and 6/22 did not respond to steroids, and later combined therapy with cyclophosphamide and cyclosporine. They developed end-stage renal failure within 4–8 years. 42/64 (65.3%) patients, 26 male, 16 female, aged 32.29 ± 1.74 presented with erythruria and non-nephrotic proteinuria. Because of the absence of nephrotic syndrome only anti-hypertensive treatment was performed in this group of patients if necessary. One patient died because of hypertension complication (intracranial hemorrhage), two developed end-stage renal failure follow-up of 12 and 6 years.     

胆道术后并发急性肾衰的营养治疗(附7例报告)

报告７例胆道术后并发急性肾衰（ＡＲＦ）、氮质血症病人实施肠外营养（ＰＮ）治疗的体会。全组病例均用含８种必需氨基酸（ＥＡＡ）的肾安，７％Ｖａｍｉｎ和氨复命等提供氮源，并以２０％和１０％Ｉｎｔｒａｌｉｐｉｄ及适量葡萄糖作为主要能源，按“全合一”营养混和液行ＰＮ治疗，疗效满意。作者认为：①针对不同原因ＡＲＦ的ＰＮ治疗，应供给足够能量和较最小需要量稍高的ＥＡＡ，使体内潴留的尿素氮转而用于合成非必需氨基酸（ＮＥＡＡ），进而再被用于合成蛋白质，以减少蛋白质分解，降低氮质血症；②ＡＲＦ时，在有限的输液量中，２０％Ｉｎｔｒａｌｉｐｉｄ不失为一种低容量、高热卡的有效制剂，应予推崇。     

Rhabdomyolysis and secondary renal failure in critically ill surgical patients

Background

Rhabdomyolysis accounts for up to 28% of the causes of posttraumatic acute renal failure requiring dialysis. Clinically significant rhabdomyolysis is poorly characterized biochemically and difficult to diagnose.

Methods

A retrospective review of all surgical, trauma, burn, and pediatric surgical patients admitted to Grady Memorial Hospital in Atlanta, GA, from January 1995, through April 2002 was performed. Patients were screened for serum creatinine, base deficit, serum creatine kinase (CK) ≥1,000, presence of myoglobinuria, or if they had a clinical diagnosis of rhabdomyolysis by an attending surgeon.

Results

The sequential addition of admission laboratory values for serum creatinine ≥1.5 mg/dL (positive predictive value [PPV] = 33%), base deficit ≤−4 (PPV = 52%), serum CK level ≥5,000 U/L (PPV = 80%), and myoglobinuria increases the ability to predict which patients will develop dialysis-requiring acute renal failure after an episode of rhabdomyolysis. Patients with maximum CK ≥5,000 are also at increased risk for persistent renal insufficiency (Cr ≥2.0 mg/dL).

Conclusions

An algorithm for testing at-risk surgical patients was developed and may aid in the early diagnosis of clinically significant rhabdomyolysis.     

血液透析对慢性肾功能衰竭病人红细胞变形能力的改善作用

本文对慢性肾功能衰竭病人及经血液透析治疗后的红细胞变形能力进行了测定。结果表明：与正常红细胞的椭园形衍射环相比，慢性肾衰病人红细胞的衍射环长轴明显缩短，短轴明显增宽，形成一个橄榄形。经过血液透析后红细胞的衍射环有明显改善，趋于正常。提示肾衰后硬化的红细胞数量明显增多，红细胞的变形能力及红细胞膜的稳定性明显降低。这些改变与机体长期处于酸中毒、水和电解质紊乱、内毒素增加及ＳＯＤ水平增高等环境有密切关系，可导致和加重肾脏微循环障碍。血液透析可有效地改善红细胞的变形能力。     

ETIOLOGY,PROGNOSIS, AND OUTCOME OF POST-OPERATIVE ACUTE RENAL FAILURE

A Multivariate analysis was done in all patients who developed post operative ARF, during the period 1990–1995 to determine the etiological spectrum and to identify various variables affecting the outcome. Of 140 patients (110 operated at SGPGI and 30 operated outside) 116 underwent elective surgery. The different types of surgery leading to ARF were urosurgery (3.5%), open heart surgery (32.9%), gastrosurgery (16.4%), pancreatic surgery (9.3%), obstetrical surgery (3.6%) and others (2.8%). The incidence of ARF in SGPGI patients was highest in pancreatic surgery group (8.2%) followed by open heart surgery (3%). The different etiological factors responsible for ARF were perioperative hypotension (67.1%), sepsis (63.6%) and exposure to nephrotoxic drugs (29.3%). Sixty-four patients (45.7%) required dialysis. The overall mortality was 45% The mortality was highest in patients who underwent open heart surgery (89.1%) followed by pancreatic surgery (84.6%). The factors associated with high mortality, other than the type of surgery, were preoperative hypotension (p <0.05), oliguria (p <0.01), need for dialysis (p <0.05) and multiorgan failure (p <0.001). AM following emergency surgery had poor outcome, though not statistically significant. Perioperative sepsis (p <0.05) and preoperative use of aminoglycoside (p <0.05) were significantly higher in patients operated outside SGPGI. This was associated with higher incidence of ARF. Thus we conclude that presence of multiorgan failure, oligoanuria, preoperative hypotension and need far dialysis are poor prognostic markers in ARF following surgery.     

LIPOGENESIS IN EXPERIMENTAL CHRONIC RENAL FAILURE IN RATS

Hyperlipidemia is a common occurance in patients with chronic renal failure (CRF) and has been the subject of many clinical and experimental studies. Despite this, the role of lipogenesis in the development of hyperlipidemia is still obscure. The present study is based on a rat model of CRF involving a two-stage subtotal nephrectomy. In this study, we measured the activity of fatty acid synthase (FAS). This is the rate-limiting enzyme of lipogenesis and is present in liver and white adipose tissue (WAT). Using isotopic methods, we also determined the rate of lipogenesis in vivo in liver and WAT. In both liver and WAT, the results of the analyses were similar. In the uremic rats, there was a tendency for the FAS activity to rise. However, the difference was not statistically significant. Furthermore, there was no increase in the rate of lipogenesis in vivo in either tissue. In summary, the results of our study confirm the thesis that lipogenesis does not play a role in the development of hypertriglyceridemia seen in an experimental CRF in rats.     

IONIZED SERUM CALCIUM LEVELS DURING ACUTE RENAL FAILURE: INTERMITTENT HEMODIALYSIS VS. CONTINUOUS HEMODIAFILTRATION

Background: Achieving “adequacy of dialysis” includes the maintenance of normal serum ionized calcium concentrations and is an important therapeutic goal in the treatment of acute renal failure (ARF). It is unknown whether this goal is best achieved with intermittent or continuous renal replacement therapy. Methods: We compared the effects of continuous veno–venous hemodiafiltration (CVVHDF) and intermittent hemodialysis (IHD) on serum ionized calcium concentrations using daily morning blood tests in 88 consecutive intensive care patients of which half were treated with IHD and half with CRRT. Results: Mean patient age was 54 ± 14 years for IHD and 60 ± 14 years for CVVHDF (NS). However, patients who received CVVHDF were significantly more critically ill (mean APACHE II scores: 24.4 ± 5.1 for IHD vs. 29.2 ± 5.7 for CVVHDF, p<0.003). Before treatment, the mean ionized calcium concentration was 1.177 ± 0.03 mmol/l for IHD and 1.172 ± 0.04 mmol/l for CVVHDF (NS), with abnormal values in 51.6% of IHD patients and in 68% of CVVHDF patients (NS). During treatment, hypocalcemia was significantly more common among CVVHDF patients (24.5% vs. 14.9%; p<0.011) while hypercalcemia was more frequent during IHD (36.1% vs. 25.6%; p<0.019). Conclusions: Abnormal serum ionized calcium concentrations are frequent in ARF patients before and during renal replacement. Once dialytic therapy is applied, CVVHDF is more likely to lower serum calcium concentrations, while IHD is more likely to induce hypercalcemia. Appreciation of these different biochemical effects may assist clinicians in adjusting dialytic therapy in selected patients.     

影响肝移植术后早期急性肾功能不全相关危险因素分析

目的探讨影响肝移植术后早期急性肾功能不全的相关危险因素。方法回顾性分析我院肝移植中心2008年3月～2009年10月间资料完整的99例肝移植患者围手术期病例资料,利用回归分析方法筛选肝移植术后急性肾功能不全（ARF）的相关因素。结果手术早期ARF患者29例（29.3%）,在回归分析中患者肝移植术前血清肌酐水平是肝移植术后急性肾功能不全独立危险因素（P=0.004）;FK506日用量是术后发生ARF独立危险因素（P=0.031）;结论术前血清肌酐、术后FK506日用量是影响肝移植早期急性肾功能不全的独立危险因素。     

END-STAGE RENAL FAILURE AFTER IRBESARTAN PRESCRIPTION IN A DIABETIC PATIENT WITH PREVIOUSLY STABLE CHRONIC RENAL INSUFFICIENCY

We report the case of a 78-year-old hypertensive diabetic patient without evidence of renal artery stenosis who had moderate chronic renal insufficiency, which had been stable for several years under low-dose captopril therapy, and who rapidly developed acute renal failure when irbesartan was prescribed. Unfortunately the medication was not stopped promptly and the patient never recovered his basal renal function and had to undergo chronic hemodialysis. This observation emphasizes the importance of a careful monitoring of renal function in patients receiving angiotensin II receptor antagonists.     

复方川芎散延缓大鼠慢性肾衰进程机理的探讨

通过观察肾功能、平均动脉压、红细胞比积、肾皮质和血浆脂质过氧化物和维生素Ｅ含量、肾皮质和红细胞超氧化物歧化酶活力、肾皮质和红细胞膜钠钾ＡＴＰ酶活力、肾皮质过氧化氢酶活力、单个核细胞内游离钙浓度、单个核细胞白介素－１产量、残肾形态学等指标，发现复方川芎散延缓５／６肾切除大鼠慢性肾衰进程的作用优于维生素Ｅ治疗，可能与其抗氧化、抑制系膜细胞增殖和钙阻断等机制有关。